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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b30661e9f204dee2dedb8fb10d69fd94ac34ca83de4d2702a982b60c5800f588' 
  AND token = '58L6aG7AX4QWvADpN6YKU+msU4PV3k8SaJ4NqamJo6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}